Creating a new payment module

[nanix84]

Hi guys,

I am trying to create a payment module that communicates to a web service.
Im not quite sure where to start. I already read this documentation http://docs.broadleafcommerce.org/core/ ... ent-module

but I don't know where would I use my newly created module.
Im currently using the demo site. Is it good to reference NullCreditCardPaymentModule.java for a payment module reference?
As far as modifying stuffs, do I need to modify the checkout controller so that it would reference to my new payment module?

Thanks